Type-writer attachment.



D. E. DUNKLE. TYPE WRITER ATTACHMENT.

APPLlcAnoN man APR. 2s, 191s.

Patented ]eb."12,1918.

2 SHEETS-SHEET i.

I I 17 /gQl.'

11 y 13 i 10 i la 11 invento/z;

n. E. DUNKIE, TYPE WRITER AYTACHIIIENT.

APPLICATION FILED -APFIIZBI $916.

1 ,256,447. Patented Feb, M1918.

2 SHEETS-SHEET 2.

DAVID E. DUNKLE, 0F NORWICH, 4lENNSYLVANIA.

TYPEWRITER ATTACHMENT.

Specification of Letters Patent.

'PateiitedFek12,1918.

yApplicationile.1fApri1r28, 1916. 'Serial No. 94,214.

T 0 all 'whom it may concern i Beit vknown that I, DAviD E. DUNKLE, a citizen of the United States,fresidinfg `at Norwich, in the county ofMcKean aiidbtate ot' Pennsylvania, have invented new and iiset'ul Improvements in Type-Writer kAttachments, otwhiich the following is fa' ySpeciyfication.

'l`heiinvention'relates to a-typewriter at- "tachinenhfand more particularly to the class `ofclectricallyoperated carriage Shifters for typewriters.

'l`liepriniary object of the invention is the rprovision of an-attachmentf of this character yivlierein the platen carriage Vof the typewriter, yafter being moved rvto athe left on 'operating -'the -keys, ywill be automatically moved-to the right, thereby obviating the hand V,shifting of fthe carriage, as usual, `which is'labcrious? to the typ-ist whenf operating the typewriter machine.

Another object of :the invention is the `provision ofY atypewriter attachment of this character wherein :the 'carriage is moved in botlidii'ections when'operating the lkeys of the ltypewriter machine, one .of the `keys'being designed `to close anormally4 open electricl circuit lwhich has iarranged therein a ysolenoid and its core of-novel construction toassurethemoving of the carriage tlieentire :distance to `the `right Awith despatch, yet `the saidfcarriage can bemoved inlthis direc- :tion by .hand as usual.

A .further object .of the invention ris the provision ot' an=attaclimcntof-this .character wherein-on theautomatic travelof thecarriage'to the Vright the kplaten thereon -willbe turnedor :rotated lforftlie feed ofpsaid -platen lfin advancing theipaper .one or imore lines for the proper line spacing of'ftypewritten matter as may be irequired, thereby obviat ing `the hand manipulation .of the platen for :the line spacing of the typewritten matter.

Astill further :object "ofithe invention eis .the provision of a typewriter attachment vof fthis character wherein A:the construction thereof :permits the saine lt'o be applied to r'different types of .standard `.makes of typewriter machines 4without :requiring l,any ma- 'terial alteration ioriclianges `therein and "tlius permitting the autoniaticci'shi-fting of the carriage .'iroin left to right fand the turning fof :the platen kfor :the v`spacing of the tygpe- 'written :matter upon the sheet when vthe E: ypew riter `machine `is operated. iA still .duxzthennbjeataf like iinveintions the provision ot an attachment of this character which is simple in construction, reliable, ellicient and vpositive -iii operation, strong, durable and inexpensive in manufacture and installation.

Other objects'will be in part obi/ions and lin parthereinafter'pointed out.

The invention accordingly consists -iiil the `features oi' construction, combination of ele- `mentsI and arrangement of parts whicliwill `be exemplified f in the construction herein after-described, and the scope ofthe application of which will be indicated in the appended claim.

`^In the accompanying drawings:

Figure 1 is-a top plan view of l:a typewriter macliineshowing the attachment constructed rin accordance with the f invention applied Fig. 2 is an end elevation thereof. Fig. 3 is an enlarged longitudinal herijZoiital sectional viewthrough thesolenoid employed.

Fig. l is a Vfragmentary vertical transverse sectional view showing iii detailthe lcircuit closing sivitclifkey. i

Fig. 5 is -a vhorizontal k'sectional View through the switch key.

Fig. 6 isa detail perspective View ofone of the brackets for fastening' the attachment lto the typewriter.

Similar kreference characters indicate cor responding parts throughout the several views ofthe drawings.

Referringto the drawings in detail, A

ydesignatesgenerally the lframe o'l' a typewriter, which is-'of .the ordinary well vknown construction, B the -iiiovable carriage 1and C .the rotatablepplaten which is journaled thev carriage for Aifnovement therewith, the

fsaid ,platen being rotated in a 'step by `step manner forthe `line spacing of the type- Written matter through the medium of the hand operated ratchet mechanism l) which,

.as usual, is atfthe right hand end :of the machine.

It is ofcourse understood that the niev positcl ends removable heads or caps 11, while interiorly of this casing is arranged the wiring 12 which is coiled or convoluted and terms the magnetic field of the solenoid, which wiring is concentric with a central guide sleeve 13 preferably made Jrom wood iiber and in which travels a magnetic core of the solenoid, the sleeve 13 being enlarged for a portion ot the inner end thereof to receive a glass insulator tube 15, in which latter and the sleeve 13 works the core 14 when the solenoid is magnetized, and this solenoid is arranged within a normally open electric circuit including the current wires 16 and 17 and a battery 1S which is suitably held, although the said wires can be connected with an electric main having arranged in series therewith a rheostat or current reducer of any suitable form, one of the current wires being broken for the interposing of a circuit closer or switch hereinafter fully described. rThe solenoid is fastened upon the frame A of the typewriter machine, and for this particular purpose there is provided a pair ot' brackets 19 which are secured to the heads ot the caps 11 and are fastened to the hangers 2O supporting the track for the movable carriage B of the typewriter machine. Secured to the movable carriage B at the rear thereof in any suitable manner is an elbow shaped arm 21 which has its short branch 22 insulated frorn and connected to the core 14 so that on movement ot the said core inwardly of the solenoid by the magnetizing thereof the carriage B will be shifted from lett to right.

The circuit closer switch comprises a base 23 formed with a vertical housing 2l, in the lower end o't which is fitted a combined binding and contact post 25 to which is connected one stretch of the broken circuit wire, while slidable in the housing 24 is a spring held plunger QG to which is connected the other stretch ot the broken circuit wire and on the outer end ot this plunger is formed a head 2T provided with a key. lVhen the plunger 2G is moved inwardly in the housing 24 to engage with the contact 25 the electric circuit is closed so that the solenoid will become energized for attracting the core 14 to pull the same inwardly within the solenoid and thus move the carriage B from left to right. thereby shitting the .same automatically. lVhen pressure is relieved from the plunger 26 this spring will normally retract the same from the contact 25. thereby opening or breaking the electric circuit, so that the carriage B will be tree for step by step movement from right to lett on operating the keys E ot the typewriter machine. Formed on the right hand end head or cap l1 centrally thereof is an air cylinder 28 having an air inlet port 29 in its outer end provided with. a valve seat 30 in which is ar- 'the inner end thereof a valve seat 34 so that ranged la ball valve 31, the latter being held within an adjustable screw plug 32 which is threaded in the port 29 and is formed with an air intake aperture 33 having at the ball valve 31 will alternately engage the respective seats 8O and 34 for permitting the intakeand exhaust of air to and from the cylinder QS, while slidable within the said cylinder 2S is an air cushion plunger 7 25 which is adapted to be attracted by the solenoid for the drawing ot'the same inwardly of the cylinder E28, thereby sucking air through the plug 32 into the said cylinder and on pulling inwardly upon the core 14 the said plunger 35 is acted upon thereby and its impact against the air confined within the cylinder QS will serve as a cushion for the core, thereby avoiding the pounding of the core within the solenoid and also gradually retarding the movement thereof when drawn fully within the solenoid. The plug 32 is readily adjustable and is held in such adjusted position through the medium of a lock nut 3G threaded thereon and working against the outer end oi the cylinder 28 so that the movement of the valve may be limited as the occasion may require to vary the action of the air cushion plunger 35 interiorly ot the said cylinder.

ln lieu of the ordinary end plate at the left hand end ot' the movable carriage B is substituted a plate 37 which has journaled therein a horizontally disposed rocking pintle 38, on the outer end of which is fixed ra trip lever including the sections 39 and 40,

respectively, which are pivotallv connected to each other at 41, the section 40 being free lfor swinging movement in one direction but limited in its swinging movement in the opposite direction so that on movement of the carriage to the left the Said lever will freely pass over a stationary trip 42 mounted on the top of the frame A of the typewriter. but on movement of the carriage to the right the trip lever will be actuated by the trip 4Q for a purpose presently described. Fixed to the pintle 38 is a hub 43 formed with a nose 44 engaging a slide pin 45 held in a guide 46 ofthe plate 37. the pin 115 45 being designed to act upon a rocking bell crank lever 47 which is pivoted to the plate 3T and is normally held against rocking movement by means of a spring 48 acting thereon. and to this lever is pivoted a ratchet feed dog 49 which is adapted to engage a ratchet wheel 50 fixed to the platen at the lett hand end thereof so that on actuation of the tripvlever, including the sections 39 and 40. when the carriage moves from left to right the ratchet dog 4f) will engage the ratchet wheel 5() for automatically turning the platen C for the feeding of the paper thereby to line space the typewritten matter thereon. -It will -be apparent that this automatic feed of the platen for the line s acing of the typewritten matter is indepen ent of the hand operated ratchet feed mechanism for the said platen of the ordinary Well known construction.

It will be apparent that when the carriage has been moved from right to left and the electric circuit is closed the solenoid attracts the core 14, thereby automatically shifting the carriage from left to right, and on this movement of the carriage the trip lever will become automatically actuated by the trip 42 for rotating the platen C for the line spacing of the typewritten matter, it being understood of course that the dog 49 can be manually set to vary the automatic line spacing in a manner similar to the setting of the feed dog of the hand operated ratchet mechanism for rotating the platen, as usual.

From the foregoing description, taken in connection with the accompanying drawings, the construction and manner of operation of my improved spacing mechanism will be readily apparent and, therefore, a more extended explanation has been omitted.

Having thus described my invention, I claim:

The combination with a solenoid, a core within said solenoid, a normally open circuit having the solenoid arranged therein, a. circuit closer arranged in said circuit, an air cylinder formed at one end of the solenoid and having an air port provided with a Valve seat, an adjustable plug arranged in the air port and having an air intake aperture, and a spherical valve located Within the port in the cylinder and Working against the seat in said port and the plug.

In testimony whereof I aiiix my signature in presence of two witnesses.

DAVID E. DUNKLE.

Witnesses:

F. A. Woizsinn, f W. T. McCLosnEY.

Copies ot this patent may be obtained for ve cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

